FP&A is the most seasonal discipline in finance hiring, and most businesses discover it at the worst possible moment. From September the budget cycle lands on a function that is already producing the monthly pack, and by October the planning work is either late or being done by someone whose day job has stopped. This guide covers the seasonal pattern, when interim FP&A cover is the right answer rather than a permanent hire, what it costs, and how to brief an assignment so it delivers something rather than merely absorbing pressure.
The seasonal pattern
The shape is consistent across the UK mid-market and it follows the calendar year-end, with a second smaller peak for March and December year-ends.
September — budget templates go out, assumptions are set, and the first realisation lands that the model built last year is not fit for this one. October is the heaviest month: budget holder submissions, iterations, consolidation, and the first board review. November brings the second and third iterations and, in investor-backed businesses, the version that goes to the sponsor. December is sign-off and the reforecast for the remainder of the year, compressed by the holidays. January is the reset — the budget becomes the baseline and the reporting has to change to reflect it.
The practical consequence is a three-to-four-month period where FP&A workload roughly doubles while monthly reporting continues unchanged. Businesses with one FP&A person, or with the planning work sitting inside a Financial Controller role, feel it acutely — and the work that gets dropped is invariably the analysis rather than the close, because the close has a deadline.
When interim cover is the right answer
Budget season with no FP&A function. The most common case. A business running planning through its FC or Finance Manager can buy three months of dedicated capacity rather than accepting a rushed budget and a quarter of neglected control work.
A model that needs rebuilding. If last year’s spreadsheet has been extended past its useful life — and most have — budget season is when it fails. An interim who has built proper three-statement models does this faster than someone learning on your business, and leaves an asset behind. Our guide to building a three-statement model covers what good looks like.
Cover for an absence at the worst time. Maternity, resignation or illness landing in September is the scenario interim exists for.
A first proper budget process. Businesses that have grown past extrapolation and need a real driver-based process frequently bring someone in to design it once, then run it themselves thereafter — a genuinely good use of a bounded engagement.
Investor or lender reporting arriving mid-cycle. A new sponsor or facility brings reporting requirements that land on top of budget season, and the two together exceed most in-house capacity.
When it is not
When the need is permanent. If the planning workload fills a year rather than a quarter, you are describing a permanent FP&A hire and repeated interim cover will cost more over three years. The honest test is whether the January workload drops back.
When the numbers underneath are not trusted. Planning built on management accounts the business disputes collapses at the first challenge, and an interim has neither the time nor the mandate to fix the close. Fix control first.
When you want capability built in the team. Interims deliver the output; they build less lasting capability than a permanent hire, unless the handover is designed in from the start.
And when it is October. Bluntly: an interim starting in late October will spend the first fortnight learning the business and arrive at the board review with limited context. Budget-season interims should be briefed in August and started in early September — which is the single most useful thing in this guide. Verify qualification with ICAEW, ACCA or CIMA before shortlist so interview time goes on capability rather than credentials.
What it costs
Interim FP&A rates sit in the same band as the equivalent permanent seniority, and the full picture across the finance function is in our interim finance rate card. For a typical budget-season engagement:
| Level | London | Regional UK | Typical assignment |
|---|---|---|---|
| FP&A Analyst | £300–£425 | £275–£375 | Consolidation, templates, support |
| FP&A Manager | £400–£600 | £350–£500 | Owns the cycle end to end |
| Senior FP&A Manager | £500–£700 | £450–£600 | Model rebuild, investor reporting |
| Head of FP&A (interim) | £650–£900 | £550–£775 | Designs the process, leads the team |
A three-month budget-season assignment at manager level therefore costs roughly £26,000–£39,000 in London for 65 working days. Where the assignment is engaged through the candidate’s own company, IR35 status must be assessed against the actual working arrangement — see HMRC’s off-payroll guidance. The comparison worth making is not against a salary but against the alternative: a rushed budget the board does not trust, plus a quarter in which the close and the controls received less attention than they should. Seasonal rates also firm up — September and October are the busiest weeks in the interim finance calendar, so booking in August is cheaper as well as better.
Briefing the assignment properly
Interim FP&A assignments fail in predictable ways, and all of them are preventable at the briefing stage.
Define the deliverable, not the cover. “Help with the budget” produces a competent pair of hands. “Rebuild the model to three-statement, run the budget process to sign-off by 30 November, and leave documented templates and a reforecast process” produces an asset.
Name the assumptions owner. An interim cannot set your growth assumptions, and time is lost when nobody in the business will. Nominate who owns each assumption before they start.
Give access to budget holders directly. An interim routing every question through the FC will be slow, and the FC is the person you are trying to free up.
Agree what happens in January. Handover, documentation, and whether the reforecast process is theirs or yours. Assignments that end at sign-off without a handover leave the business no better placed next September.
Our guide to briefing an interim finance search covers the wider process, and the interim handover guide the ending.
What to look for in the candidate
Four things, and the first two carry most of the weight. Cycle ownership — ask them to walk through a budget process they ran day by day, including what went wrong; owners describe the arguments and the timetable, contributors describe the output. Modelling under time pressure — a model built in three weeks that others can use and audit is a different skill from one built over six months. Speed of orientation: budget-season interims have weeks, not months, so ask what they do in their first five days. And the ability to challenge budget holders they have no authority over, which is the whole job in a compressed timeframe. Our FP&A interview questions guide covers the assessment in full.
Interim, fractional or permanent?
The seasonal shape makes this decision unusually clear. Interim suits budget season precisely because the workload is bounded and dated — you can name the end. Fractional suits a business whose planning need is real but part-week all year, rather than concentrated. Permanent suits a business where the January workload does not drop. Businesses that hire an interim three years running for the same three months are describing a permanent role and paying a premium for the privilege of not admitting it. Our comparison of interim versus fractional finance covers the choice, and the Head of FP&A guide the point at which planning needs its own owner.
A Note from Our Founder — Adrian Lawrence FCA
The mistake I see every autumn is a business ringing in the third week of October, having decided in September that they would manage. By then the interim market has tightened, the rates have firmed, and whoever starts has three weeks to understand a business before the board sees the budget. The businesses that get real value from interim FP&A brief it in August and start in the first week of September — the same people are available, they cost slightly less, and they arrive with time to build something rather than to catch up. If your budget process starts in September and you already suspect you are short, that decision is best made now rather than in six weeks.
Adrian Lawrence FCA
Founder, Accountancy Capital — Fellow of the ICAEW. Verify via ICAEW.
Related Recruitment & Guides
Accountancy Capital places interim and permanent FP&A professionals across the UK, with interim shortlists in 48–72 hours. Every search is led personally by Adrian Lawrence FCA, Fellow of the ICAEW.
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